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Full text of "The manufacture and properties of iron and steel"

METALLURGY OF IRON AND STEEL.
will appear that a different value was obtained for a starting point and a. different value for the increment. The law of variation in the effect of manganese upon acid steels is shown in Table XVII-R., It is possible to calculate manganese in the same way that phosphorus was determined, by making a true average of the different values of manganese found from the lines in Pig. XYII-C. After doing this and carrying out the system of successive approximations tp the end, it was found that each .01 per cent, of manganese in acid steel in excess of .40 per cent, raised the strength 250 pounds per square inch. This change in the value of manganese made a slight change in the value of carbon and in the base, and when the new formula was applied to the list of groups, as in Table XVII-Y, it was found that it did not give as accurate results as the original formula with the sliding scale for manganese.
EFFECT OF SULPHUR ON ACID STEEL.
 The heats were classified according to their sulphur content, the results being given in Table XVII-S and in Fig. XVII-D. It is shown that sulphur has little influence upon the strength of acid steel.
TABLE XVII-E. Effect of Manganese upon Acid Steel.
-+3	Manganese ; pounds per square inch.										
O 	Per	Per	Per	Per	Per	Per	Per	Per	Per	Per	Per
oi,	cent.	cent.	cent.	cent.	cent.	cent.	cent.	cent.	cent.	cent.	cent.
s-/ PI	0.40	0.42	0.44	0.46	0.48	0.50	0.52	0.54	0.56	0.58	0.60
0.10		160	320	480	640	800	960	1120	1280	1440	1600
0.15		240	480	720	960	1200	1440	1680	1920	2160	2400
0.20		320	640	960	1280	1600	1920	2240	2560	2880	3200
0.25		400	800	1200	1600	2000	2400	2800	3200	3600	4000
0.30		480	960	1440	1920	2400	2880		3840	4320	4800
0.35		560	1120	1680	2240	2800	3360	3920	4480	5040	5600
0.40		640	1280	1920	2560	3200	3840	4480	5120	5760	6400
0.45		720	1440	2160	2880	3600	4320	5040	5760	6480	7200
0.50		800	1600	2400	3200	4000	4800	5600	6400	7200	8000
0.55		880	1760	2640	3520	4400	5280	6160	7040	7920	8800
0.60		960	1920	2880	3840	4800	5760	6720	7680	8640	9600
EFFECT OF CARBON-ON ACID STEEL.
Having found the effect of manganese and phosphorus it becomes possible to correct the original line so as to determine the value of carbon. Table XVII-S gives the corrected values, which are plotted